You should see a3-Dfigure.
The magnetic fieldBisupwardshown
by ablue vectoralong
thePositive Y-axis. The
electric fieldEis
shown by ared vectoralong
thepositive X-axis.In
each caseof this experiment,
we willset the electric fieldcomponentsequal
to zerobecause we are
studying the motion of a charged particle in a magnetic filed only.

Above the coordinates system, spaces are provided to type in the desired
values forEx,
Ey,andEz.
Before setting them equal to zero, the drift velocity,Vi,
orVd,
must be determined for each run. If you hold the left click down and try
to pull the tip of theVdvector,
it will move and appears as asmall
red vectorwith a small head.
The magnitude ofVdcan
be read asViin
the top left corner of the rectangle in which this3-Ddiagram
is. As you move the mouse, the values of the components of the
velocity vector Vichange
allowing you to set it at any desired value.

For each case ofTable 1:

1)Adjust the value of VdorVias
given in theTable 1by
the left click held down.

2)Select one value forq/Mand
one forBand
type them in.

3)SetEx=
0, (EyandEzare
already zero).

4)Click start.
You will see the time running. If
you measure timetofnrotations
and then divide it byn,
you will find theperiod
of rotation,T.

5)sincew=2p/T,divide2pbyTto
get the value forw.

6)This value of wis
yourmeasured value.
It must be very close or equal to theaccepted
valuethat youcalculate
from Formula(1)above.

7)Calculate a % error
for each case.

Note:To
completely reset the applet for each new case, you must click on refresh and
refresh the screen.

Data:

Given and Measured:

Table 1

Case

Vd

m/s

B

Tesla

q/M

C/kg

t

sec.

n

turns

T =

t /n

Accepted

w=(q/M)B

Measured

w = 2π/T

%

error

1

20.0

50.0

0.01

2

30.0

40.0

0.025

3

35.0

80.0

0.025

4

40.0

80.0

0.050

5

50.0

90.0

0.060

Calculations:

Follow the steps under "Procedure."

Comparison of the
Results:

The accepted and measured values ofwmay
be used to obtain a percent error.